Brake liner



M. STEDER BRAKE LINER Filed May 9' 1956 INVENT R:

ATTORNEY.

Patented July 20, l 1937 UNITED STATES munir:v man Marshall Steeler,Chicago, lll., assigner to L. J. Mile'y Company, Chicago, Ill., acorporation of Illinois Application May 9, 1936,v Seriall No. 78,885

Claims. IBSA-251) This inventionvrelates to brake liners, such as areadapted to be applied to brake shoes, or brake drums. Consider a brakeshoe of a conventional auto- 5 mobile brake, by way of example. Thebrake shoe has the brake hner secured thereto, generally by rivets. Itis now customary to sell brake liners already cut to size and providedwith rivet holes" properly spaced to it the liner strip on the brakeshoe of a predetermined standard automobile.

There are certain objections to the use of rivets for securing the brakeliner to the brake shoe, but

insofar as I have been able t ascertain, no betterY way of securing thetwo together has, heretofore,

1" been provided. It is one of they objects of the.v

they may be of a smallersize, or fewer in number, than is now generallyrequired. Another one of the troublesome features of present day brakeshoe liners lies in the 'fact that dirt, or moisture, may enter into thesmall spaces between the brake liner and the brake fshoe, and in timeproduce' harmful lresults. To

. prevent this it has, heretofore, been proposed to fill theirregularities -of they brake shoe surfacea with some plastic materialwhich is relied upon only for preventing the ingress of foreign matterinto the space4 between the brake shoe'and the brake liner. It is anobject of the present invention to provide av suitableller in the spacebetween the brake shoe and the brake liner for preventing the entranceofforeign materials into that space, "which ller may also be utilized tosecure, or to help secure, the brake liner to the vbrake shoe. I proposetouse, as a filler, a cementitious'material. The material used is onewhich 40 win aahere to the brake liner and which win adhere to the brakeshoe. A rubberized cement is one suitable material.

It is a still further object of the present in ventionto provide abra-ke shoe liner which has,

applied to it', a suitablev cementitious material,

and can be sold as an article of manufacture with said material in placeso that the liner is ready for use. The liner may be any suitable typeof liner, for instance, the woven type, the molded type, or any othertype.l That surface of the liner which is to engage the brake shoe iscoated with a suitable cementitious material. f If the cementitiousmaterial is of th'e plastic or tacky I vtype it may be covered 'by aprotecting layer of` the necessity for brushing additional plasticmaterial onto the brake shoe, lor onto the liner. If

desired the cementitiousmaterial alone may be relied upon for holdingthe brake liner in place.

other additional means may be provided such as, for instance, a tongueand groove arrangementv on the liner and on the brake shoe. Ii desired,

the cementitiousmaterial may be of a kind which ordinarilyv is dry andmust be treated in a suitable manner to make it adhsive. When this isthe case a protective layer of cloth, or the like, need notbe applied tothe brake shoe. Such cementitious materials may be of the type that arerendered effective by applying water, or other chemicals thereto. If thecementitious material te cemented directiy to' the brake shoe without 5On other installations the liner may, in addition, 1 be riveted inplace, or any one of a plurality of is of the type that is renderedeffective bythe application of water thereto it must also be of` thetype wherein the process is non-reversible so that after its rst dryinga subsequent wetting thereof does not again make it plastic. While Ihave here spoken of a brake shoe, to which the brak liner is to beapplied, it is to be understood that the present invention is equallyapplicable to brake liners'that'are to be applied to brake bands insteadof to brake shoes.

The attainment of the above and further objects f the present inventionwillbe apparent from the following specification taken in con junctionwith the accompanying drawing forming a part thereof.V

In the drawing:

Figure 1 is a fragmentary perspective, view of a portion of a brakeliner constructed in accordanceiwith the teachings of the presentinvention, a part of the protective 'covering being removed forillustrative purposes;

Figure 2 is a sectional view of the liner oi the present invention;

Figure 3 is a diagrammatic view' illustrating the liner as applied to aconventional brake shoe;

FigureA 4 is a sectional view, corresponding to Figure 2, andillustrating a modified construcvsurface ofthe brake liner of Figure 4.

Reference may now be had to Figure 1 show-1,' ing one embodiment of the.present invention. il brake liner is indicated lat I. Thisliner may beiof any standard construction, may be the woven type, or the molded type,or any other desired type, and is of a length and width requisite forfitting on the brake shoe of one standard type of automobile. It isprovided with a plurality of rivet holes 3 3 properly spaced in relationto the spacing of corresponding rivet holes on the brake shoe to whichthe liner is to be applied. If desired, the rivet holes may be entirelyomitted. A coating 4, of plastic cementitious material, is applied toonesurfac'e of the brake liner, namely, the surface that is to beapplied to the brake shoe. Any desired, and suitable, type of cemen'titious material may be used. A rubberized cement is suitable. Ihepur'pose of this cementitious material'is to cement the liner to thebrake shoe. If the cementitious material is ofl the type that is plasticbeforey it-is used, there is applied a protective sheet 6 of paper,canvas, or the like, vwhich protects and preserves the cementitiousmaterial and retains it in its plastic form. The sheet 6 may beremovedreadily from the liner, immediately before the liner is to `be appliedto the brake shoe. Thus, during the shipment and storage of the liner,the same is in a form such that it can conveniently be handled, whilethe cementitious material is prevented from setting. Instead of a moist,or sticky cementitious material I may use a type of cement or adhesivewhich when applied to the brake liner is not moist, or sticky, butbecomes sticky when moistened with water, or when some other liquidchemical is applied thereto, such as alcohol, gasoline, kerosene, or thelike. Of'course, if the substance is one that becomes sticky by theappucanon of water thereto, then it should be or the type wherein such achange takes place when it has been moistened and becomes dry that theprocess cannot again be repeated.'v This is essential because it isdesired that once the brake liner is applied to the brake shoe it shalladhere thereto even though the brake shoe subsequently be'- comes wet,as is not at all unusual. When the cementitious material 4 that isapplied to the brake linerrl is of the dry type, mentioned above,

the protective sheet 8 may be entirely omitted.

In order to apply the brake liner of Figure 1 to a standard form ofbrake shoe for which this particular liner is designed, it is merelynecessary to remove the sheet 8 and then placev the liner over the brakeshoe. 'I'he cementitious material 4 will flll any slight irregularitiesin the brake lshoe surface, thus preventing the entrance of moisture,dirt, or other foreign material between the liner and thebrake shoe. Thecementitious material will also serve to secure theliner't'o the brakeshoe, since the material is such that 'it will adhere to the vsurface ofthe brake shoe.

In Figure 3 I have shown a standard type of metal brake shoe which is ofa T-shaped cross section, having a stem I0 and a liner receiving flangeH. The brake liner l is applied to the ange Il, to which thecementitious' material 4 adheres, thus cementing the liner to the brakeshoe. In Figure 3 I have shown the usual rivets l2 that are generallyused for riveting' a brake tional holding means f or the brake liner. Ifdesired, these rivets may be entirely omitted, or some of them may-beomitted.

'In Figures 4 and 5 I have shown a modied form of brake shoe liner.'I'he modification consists, essentially, in the fact that the innersurface of the liner is roughened,`by milling or knurl'- ing, asindicated at 20. 'I'his increases the surface with which thecementitious material 4 is in contact, thereby increasing the hold ofthe ce-v mentitious'materlal on the liner. l

While I have shown, in Figure 5, the knurling in the form of closelyspaced grooves crossing one another, it is to be understood that anyother desired type of roughening or groove formation may be used. f

While I have here shown my brake liner as applied to a brake shoe, itis,'of course,.under stood that the liner may also be designed forapplication to a brake band, instead of a brake shoe. y Y

(In compliance with the requirements of the patent statutes I have hereshown and described a few preferred embodiments` o f my invention. Itis, however, to be understood thatlthe invention is not limited to ytheprecise constructions here shown, the same being merely illustrative ofthe principles of the invention. What I consider new and desire tosecure by Letters Patent is:

1. A brake liner comprising a body of preformed brake lining materialhaving a plastic coating applied to one surface thereof, and a re- Iliner being conditioned so that the exposed surfaces thereof are dry andnon-tacky.

4. A brake liner comprising a body of brake lining material forattachment to one part of two relatively movable braking elements of abrake, one surface of-the material being roughened to increase theeffective surface area, a layer of cementitious material coating saidroughened surface, and a removable protective covering over said coatedsurface. ,l

5. A ybrake liner comprising a body of brake lining material forattachmentto one of `two -relatively movable braking elements of a braketo constitute a grippingv surface 'for effecting a braking action, onesurface of said liner being coated with a cementitious materialvwhich iseffective at room temperature to 'cement the liner to said brakingelement, vand said coated liner being conditioned for shipment andstorage apart from a braking element tor which it is to belattached. A

MARSHALL STEDER.

a liner to a brake shoe. These rivets serve as addi'-

